This has some interesting puzzles! I started playing without reading the description first and was confused why I couldn't use a key after looping (I think on level 4), but after noticing the item slot in the lower right I was able to learn everything else pretty smoothly!

I like the idea of platform puzzle game, sometimes require skill to make it and that's makes it more challenging, great work!

The concept is very catchy! The fact that you can only move forward is really well done! Congratulations on that! I love the smooth little music in the background. ^^

It generally reminded me a bit of VVVVVV (which is a compliment ^^). Bravo!

Nice lil game, though the room with 4 keys and 3 doors, I couldn’t understand how to win; I was able to collect all the keys but only open one door.

I appreciate how much it makes me think, though :)

fun restrictive game concept! thank you for including a quick restart button

An audio file has never turned me on this much, but this game made me feel something else. Excellent level design and commendable constraint of moving in one direction. 

Very cool puzzle game 👍👍

This is a really fun idea and surprised me a little bit. Art also very nice!