This is a pretty nice game. The upgrades are pretty good and the general layouts are nice.
I do think though that it lacks a lot of polish. For example, the first enemy, I wasn't even sure if I was 'hurting' it. The knockback is too fast, and the sound effect didn't sound like 'hurt' and so I was thinking it was an invulnerable ghost that I need a new sword to defeat. When I fought the squid though, I realized that I could kill them. I think it would have been good if there was some more polish to the combat and make it feel like I'm registering a hit.
I think the first roof area was quite a bit of an odd level layout. It wasn't immediately obvious to me that you had to jump on to the roof, so I tried jumping through the hole (and bump my head and fall). I did this twice (I thought I just messed up the timing). I understand that part of it is to show the use of the mobility options, but I feel like it would have been less frustrating if the hole wouldn't drop you down to the first floor again (and have to trek back up). I wasn't sure if it served as a 'tutorial' to show how the dash is useful, but imo it should have been less 'punishing' in pushing you back.
There were also instances were I got put out of the screen, and I had to reload my save (because I was out of the camera).
Overall I think the game is nice, and the mobility options are great, but it did feel like some parts of it could have been improved.