I was a little uncomfortable about posting something so obviously unfinished to the repo; I think I did this before with this game and it was frowned upon, so it'll probably live here until it's had time to mature some.
Okay, I didn't get to play it last night, but I've played it this morning. Here's my thoughts
1. The intro video - isn't very descriptive. I have no idea what that building is or what it relates to in the game? Not sure if it's something you'll reveal through the game, but just seems a bit weird at the minute.
2. Brightness - On the second screen, there's water at the top, but it's too dark to really tell, so I was drowning and didn't really know what was going on. It didn't take me too long to figure out, so it's not a bit deal.
3. Controls - I don't know why, but I keep pressing the wrong buttons, it'd be great if (A) and (Y) would also repeat ( B) and (X), or have custom layout in the options. That said, a bit of practice, and I'm sure that'll disappear
4. Graphics - Love them! Think they look great. Your backgrounds are nice, and the comets look good. Everything feels like it belongs in the same game, even the intro (despite it being, or at least looking, 3D rendered)
5. Gameplay - I levelled up, but I didn't really know what that does or did to my character?
6. Audio - Music fit really well, and the SFX were okay. I think Emily's jump/land sound might get a bit annoying after some time, but not sure.
7. Glitch - In the Test Boss room, with the spikes all round and the three central pillars, I killed the boss, and jumped from the right hand side towards the blocked exit on the left. I then somehow found myself inside the wall getting spiked, and there was no way out.
All in all though, I think it's fantastic, and I hope you keep up with the project. I look forward to playing it some more