The art and sound on this were excellent! Unfortunately I really struggled with actually progressing so it's hard to judge the metroivania-ness (as well as the effects of claustrophobia). I tried the "claw" boss several times but never figured out how to damage the main part and would get stuck in this loops of constant damage so having period of invulnerability would be good. The firing also felt weird not seeing the bullet or at least a smoke trail. Gamepad support would also have been really nice. I like where thing are going though, hopefully some of the kinks can get ironed out, would love to see more.
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Thanks for the feedback! I will try implement these changes soon.
The boss you mentioned is defeated by shooting upward after shooting the canons, but considering another playtester's download wouldn't let them aim diagonally, I wouldn't be surprised if something else was amiss.
Thanks again for letting me know!