Found this to be really fun, especially in respect to the art and sound effect choices. However, though I like platformers, I found this one to be a bit tedious in terms of progression. Maybe it's because the checkpoints sometimes feel coming quite rarely, making it harder to progress or a bit confusing in terms of making me question whether I am doing and going where it was intended for me to go. Or it is a bit confusing map layout. Since it is disjointed and it's not a specific world, where platforms can come here and there - it makes it harder to keep track of where I am in respect to everything else.
To make criticism valid and make a point, if in the future this will be developed further as you mentioned (and it would be amazing to see that, really), maybe adding of a simple map system that at least keeps track of where you were would be very welcomed and it would solve the confusion I ran into a bit. As an example of a simple yet effective map, I remember the game Untitled Story (similar art and gameplay direction). Map was just a separate screen that you could call and was just a set of cubes colored into the environment colors to make it easier to keep track of things, since that game also had a similar room-interconnected layout and could at times get random and confusing, but the map was a saving grace. But of course, it also would be great to see something new too that you come up purely on your own. What I brought up was just a small suggestion after playing the game :)