Cool game! The first thought I had was that the game was really pretty, and later on I was also impressed with the gameplay. Jumping around with the pulse gun is lots of fun.
It could be just me but I feel like I'm seeing some influence from Celeste and Animal Well, which is very cool.
It was also impressive to see how many different mechanics were added to the game, as they all felt nice. I also liked the challenge rooms.
I have two small gripes with the game - the first is that the recurring wave, while mysterious, doesn't really add much to the game (at least at the start) and in general feels disconnected from the rest of the game design. This is a shame because obviously care and effort went into it, with the dedicated UI and graphics and SFX, but it just feels disconnected.
The second gripe is that at times the level design feels very "loose". Some parts feel like they have lots of intentionality in them and a specific platforming challenge you need to perform, while others feel more like some enemies and some collectibles were thrown in.
Overall, a great game and one I think worth iterating on even further. Good job!