This is an excellent first game project, especially if you made everything yourself in only a month! I really like the concept and you have a lot of great pixel art in there! You have some great visual polish like the trail on dashing, hit flash on damage, and particles when an enemy dies. I'm a fan of the light effect as well and seeing the brown color for the first time is a great moment.
Some feedback: I think dashing over the pits is really difficult. I couldn't tell what the grey switches by the skool or the yellow/red switches in the brown area did. The biggest one though is for your next project you should try to get some placeholder sounds in the game really early. Sound is the biggest bang for your buck you can get for game feel. It's tough to do sound implementation if you leave it for later, but it becomes really manageable if while you're making mechanics you add placeholder sounds in. It'll make your game feel better instantly, and it's much easier to go back and replace the sound file rather than do the whole implementation, and you won't forget about it since you'll hear the placeholder sounds in development. Also generic placeholder sounds are often better than no sound at all if they make it into submission.
Awesome job!
Metroidvania Month 31 x Magical Girl Game Jam 13 » Entries » Chroma Crystal - Episode IV: The Tarnished Prince and the Pearlescent Heroine