Very good looking game, I love all of the little details in the backgrounds and the enemies designs.
The soundtrack is fire, extremely catchy. I think this is the main thing that kept me playing ahah.
The game has a lot of potential but it falls in a bunch of level design and game design pitfall... the platforming feels off because the inertia is weird (not very megaman-y), the level design is riddled with little things that made me scream, like the collisions right over the character's head before a long jump, the enemies spawning out of sight after a jump, etc.
I'm being a bit harsh here but it's mainly because there's a lot to love otherwise, it just requires some tightening of the mechanics and LD!
EDIT : I just played through the postjam version and finished the game.
Controls feel waaay more tight, this is really great.
I'm a bit conflicted because I enjoyed learning the game and the levels, and I'm happy I beat it.
I still feel like a lot of things in there are vestiges from the past better left untouched, like multiple minutes segments between checkpoints, free fall segments inbtween instant kill spikes, that Fireman boss with patterns that feel like they're beyond human reaction time...
In any case, the mood is great, the quantity of content in there is super impressive, and a lot of things feel very satisfying (sometimes after feeling frustrating for 15 minutes but still).
Just one thing : I have still no idea what this has to do with the Plant theme :D