I like the way you use dying as a method of solving puzzles. I'd like to see some more complex uses of it since currently the main use is to turn your corpses into platforms.
The sliding movement is annoying, it makes a parkour type game a lot more difficult unless the game is designed around sliding (such as that csgo sliding mod) It has thrown me off a lot of places which does not feel too great.
I like having the ability to change my loadout, although some abilities feel somewhat useless (the high jump has not proven to be very good).
The artstlye is nice, you should update your ui to match it better.
Text in some of the maps needs to be shown earlier since it can be read fully a bit late.
You shouldnt keep all old builds of your game on itch, it can be confusing to more casual players, maybe look into butler for itch so you can auto update the game.
Overall, I think the game is nice, keep at it, Id love to see this finished!