Fall Inverted is a challenging puzzle platformer with good and fun put together levels.
My personal experience with the game was kinda mixed.
To start things of, I think you did a great job on designing the levels. Apart from one or two passages, I felt like there was a good variety of puzzles to solve, and with puzzles I mean how to get forward in the level by jumping, dashing, and switching between normal and inverted mode at the right time.
Here comes my first point of critism: I often was confused by the different input methos. Using mouse, shift and the jump button for the different actions felt kinda off to me and was hard to pick up. I often knew how to get further in the level but felt like it was too hard for me to translate that to the correct input. Me and my flatmate both struggled with this and then decided to map the input buttons to our XBox controller and after figuring out a controller figuration which worked for us, playing the game felt way better and smooth in general! :)
Next I personally felt really stressed by the wall and couldnt really enjoy the leveldesign and gameplay generally as I was always scared by the fast wall. I had no time to figure out the puzzles and was frustrated quickly (too hard for me^^). I then figured out you have options for turning of the wall and the levelscroll (thank god - that really made me dizzy and it didnt help me at all as it is waaaaay to fast). After turning of the wall things changed kinda quickly. I then really enjoyed figuring out a way to get to to the next checkpoint as I finally had time to get used to the controls as well as actually look around in the level. Heres my suggestion for your game. Disable the wall on default and make it an additional hard mode instead. I finished your game, but only without the wall and it felt a bit bad to be honest. If without wall was the "normal" mode, I would have felt great instead. Let the hardcore gamers play hardmode - I beat the game already anway. Now I feel like a noob as I was too bad to win with the wall (which currently is the "normal" mode) :D
Lastly it would have been great to get a bit more feedback as a player. Most importantly some kind of represantation of the dashcooldown would have helped a lot. In the current build I often wasnt sure if I pressed the right key when I wanted to dash (increased my control input confusion) and made me press another key instead as I didnt know the das is on cooldown and my input did "nothing". The feedback could be a color fade of the player sprites or anything else that works. Also the feedback message when your stuck on the wall was kinda annoying, another feedback solution would be appreciated for the wall-stuck-problem (first I didnt even understand why I cant switch world).
You made great use of the assets and I really liked the style of the game! Only the player character could have been something more fitting in my opinion - maybe a cute squirrel running around the forest would be cool, there then could also be pickups in the form of acorns and more :)