Really lovely designed. I liked the introduction very much. All those cute cubes got a lot of character in their messages. The music gives a good mood atmosphere. Even though the art is simple on the first view it's more complex in detail. The animations are great especially the running animation. The dying and checkpoint particles are also really cool. And it is nice that your progress is saved.
The levels themselves are really hart and a little bit frustrating on some places. I think a problem is that you need to run & jump on small areas. But for running you need to double tap the walking direction first. This takes sometimes to long. I think it would be better to run while holding shift button or something like that.
I liked the idea to pickup different types of glitches.
Overall an amazing plattformer game. I had a lot of fun playing it :)