This game is pretty cool. I think the details and little motions going on in the background are great.
Definitely feels like some Celeste platforming DNA in this especially with the dash jump and moving platform jumping.
A weird wish, if you'll entertain it: I would have loved more "recoverability". In Celeste, you can recover from a ton of ridiculous situations. In Abertha, I felt more like everything leads you into situations instead. Dash jumping tends to get you hit by damaging blocks and enemies (and those fly dudes... do you intend on working for Team Cherry?), midair praying (initially) only boosts you up 1/3 or 1/2 a block so I felt like it didn't help me recover as much as the dash from Celeste or the luma spin from Mario Galaxy, and even when you do get the bigger boost (thank you for that by the way :D), it tends to get you hit by the bats + projectiles instead. Then again, this is a really odd point, and it's possible that no one else felt this way, so do take it with a grain of salt.
Overall, I think you did a lot with the time you had, and this totally feels like a project that could go even bigger and better. Well done!