Looks like a cool idea (the sliding thing is a classic but it's always fun to me), but there are several issues with how the idea was developed.
- Many times, the level is a copy of the precedent one but with an extra part at the end. Minor issue, but it makes it feel a tad bit repetitive since I have to re-perform the same thing I just solved.
- Alongside the thematic bugs, there are several bugs that don't seem like they're part of the game. Many other reviewers already reported a few, mine was quite strange; I could move the character around, but it wouldn't interact with anything but walls. Spikes and teleporters were effectless, rendering me stuck in the level. I indeed had to stop playing there. Not sure what can cause this, a race condition maybe? (Relevant info : I have pressed escape once since I saw it was the key for the pause/menu, which didn't appear, so I went back to playing and realised the bug.)
- Sometimes upon dying (not sure if it's random or if there's a rule), I have to restart the entire stage. Never, ever do! Forcing the player to re-do what they already did is extremely boring and the best way to lose their attention! I'm not sure if it's a feature or an unintended bug, but in any case it is important to fix that. At least (if it's a feature), you would need to implement a life count system so it's clear to the player.
- The effects are cool but waaaaay to invasive. The small effects (like the fish-eye and intermittent "glitch curve" passing through the screen) were quite nice, but some really look like they were abused. For example, sometimes, when sliding, there is a clear visual & audio glitch effect playing. It looks cool, problem is it plays way too frequently. Considering how imposing it is, I'd recommend you don't use it more than once per level on average. You can, for example, play it when a level is finished or just started. (At the same time I don't recommend playing it too sparingly or randomly; it might feel a bit jumpscare-ish.)
Not sure if the jam had a harsh time limit, but if it did, it definetly played bad for that game. It looks like a nice idea, but it feels quite rushed and untested. I'd recommend to spend more time testing, polishing and asking people to test your games to have some user feedback - don't undervalue the user feedback!
Best of lucks for your next projects!