Haha, fun concept. I got confused when it said I lost immediately and then I understood haha.  Nice pixel art :) 

I did come across what I think is a bug on the 3rd level where I couldn't jump up the wall, and then occasionally it would make me fly up to the ceiling. I also got a bug where when i got hit by a razor it would just keep saying 'Retry'/'Menu' and no matter how many times i clicked Retry it didn't seem  to restart the level. 

I think adding sound would be a great addition; some nice background music and a sound effect that happens every time you jump would make it even better :)

But otherwise, a  nice idea! Well done!

Funny concept. Nice pixel art

Some funny sounds would go well with it. 

Great job!

Haha! I was so confused by the retry screen at the start until I realised! :P Very clever. It's interesting how your brain slowly adapts to going backwards too, though I still wasn't very good. The pixel graphics are cute too. Good job. :)

Interesting concept to start the game at the retry screen and then play the map in reverse with reversed controls. For added difficulty, perhaps the character could move a little faster. 

Further improvements: Currently when you do get hit by the razor projectile things it brings up the retry screen, however, clicking retry doesn't do anything . Or when you fall of the map, the retry doesn't bring you back to the beginning or back to the map so you'll have to manually go to menu to restart the level. Consider adding a type of check for how the player died. 

Good luck with future projects!

I actually enjoyed the game. Started playing it and thought, oh this should be easy. But your brain is so trained of the correct directions that muscle memory always takes over and kills you. Really intriguing concept and I had lots of fun. My only comment would be to look at the friction between the character and the walls/blocks. It makes the jumping very iffy.

Pretty nice game! I really enjoyed playing it. It was a bunch of fun. Keep it on :D

Playing a game backwards really fits this theme and I really like the concept! While the controls being backwards does fit the theme, I felt as if they were not intuitive, making the game hard to play. Maybe introducing the controls at a slower pace could make it easier to get used to the controls. On further play, I really like your indicators for enemies as well as the wall jumping mechanic where placing walls will allow you to climb up higher. Nice job!