I really liked the sense of progression and the fact that new upgrades really change how you see and move in the world which is a core tenet of the metroidvania genre. The only flaw I found was that controls were not too much responsive, sometimes jumps would not trigger, and the physics overall felt a bit too "floaty", and sometimes the big knockback that enemies give can feel frustrating. I suppose I got the "normal ending" (it seemed from the end screen that there could be some other ending), but I definitely enjoyed playing this and all the upgrades felt very original and a good twist from how they are usually implented.
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Ha sorry about that there is only one ending I just felt the question mark gave an air of mystery as to what is on the other side of the canvas, plus I quite like the character so I might one day extend the game or make a sequel...
The movement could have definitely used a bit of tweaking, the large knockback (and getting caught in knockback loops against walls)_ were all hacks to try and prevent death from getting hit multiple times by the same enemies. but again could have been done with a bit more finesse (or just a few iframes)