Akin to Mario Maker, have levels displayed in the lobby have a preview. There could both be a small little thumbnail showing a bit of the level and a full view of the level; the thumbnail could be determined by the user (like Mario Maker, perhaps based on the location of their last save, or some other system).

If a player is looking to get a good time on a level, it's good to be able to practice any section at any time. Unfortunately, there's no really easy way to do this, unless you made the level yourself and want to practice in the LE, and even then it's a bit cumbersome, having to rely on teleports and the slow restart button.

Practice mode should enable something like the following:
- a means to easily reset one's position anywhere anytime, with a command/button press, for nailing hard tricks
- the ability to "noclip" and fly to any given point on the level, quickly and easily (could coexist with the usual LE click-to-teleport or, or use something like PR2's spectator mode, and it would be nice if scrolling the camera would be faster too) 
- pausing/changing the timer so one can practice for as long as they'd like

This could include a suite of other things; whatever's needed to give players all the tools they need to succeed in their runs. I'm sure other people could think of more things. This also would go hand in hand with my Retry button suggestion.

Clearing a level in practice mode would obviously not grant any of the rewards (medals, best time, EXP, what have you).

If a player is doing a single player race, there should be a seamless, easy "retry" button when playing a level that resets the level to the beginning without having to redraw/rebuild it, setting blocks and the timer to how they were at the beginning. I suppose this could also be an option in multiplayer; perhaps an option to vote for a reset, and if all players participating agree to it, it would reset. This should be as instantaneous as possible to reduce any downtime between attempts; within the frame, if possible. This could be a GUI button or a bindable key. This should also skip the countdown, or have it go instantly.
It's a real pain in PR2 resetting (say if one is looking to do a good speedrun), having to exit out of the level back into the lobby, rentering the level, and having it draw again (especially in artistically vibrant levels; disabling the art isn't fun!).

Rather than only having a fixed amount of art layers ala PR2, it would be nice if players could have as many as needed (or at least a good number more than what is available), both in front and behind the level's geometry. What would also be good is a fixed background layer that doesn't scroll. 
I believe PR3R has this feature.

Akin to PR3's campaign, levels should have custom par times players could shoot for; perhaps having just one par time or a gold/silver/bronze medal system. If a user sets medal times, there should be a clear check to make sure that clearing the level in that time is possible. If the level ends up in a campaign, admins could tweak the times if need be. Levels could also have saved world records, to challenge the best of players.

'nuff said. 45 degrees only could be good, but you could have a variety of different grades. 

It would make sense for the only blocks to be "slopified" are the basic blocks. Might have to change the way tiles are handled to make it look more clean.

Bonus points if you include a Mario-esque buttslide mechanic. This might be too much, though; how the game might improve on the movement is up to Jiggmin.

I think it would be cool if player physics were more "physical" than in PR2 (either via manual implementation or by building the player controller on top of a 2D rigid body, for instance). Although it felt a bit sluggish with base stats, in my opinion PR3 had a really fun sense of momentum with stuff like bounce blocks, mines, angel wings, etc., and I'd love to see this direction developed further with more dynamic and interesting movement in PR4. This could also open up a whole world of possibilities for cool gameplay elements that weren't possible in previous PR games.

Some of the blocks I feel are a bit too detailed compared to other blocks. The main blocks I feel this with are:
Happy Block, Sad Block, Mine, Crumble

Alien egg is creepy but depending on what's been gone for with it, it could work well

https://camer-the-dragon.itch.io/super-d...tacle-race

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New Reverse Mode! (also a lot of backend stuff to standardise/automate processes)

Video Description notes:
Note 1: Images are placeholders including the SAR backgrounds, they won't stay like that lol
Note 2: Not all systems/etc. shown in the video are final (e.g. settings menu will change)
Note 3: Some things shown may not be added due to errors (the thing where you can see the blocks loading in is incredibly buggy if you try to close the window or go back, some of the time it will freeze badly)

Music is subject to the creators' continued permission to use it in the game
Music Credit:
Songs 1 and 2 - @LuniFoxo
Song 3 - @Adulock77