Really really great art! I kind of wish the game moved faster, and from a design perspective it doesn't seem like there's a reason to ever just jump when flips accomplish the same dodging ability and attack the tentacles. Maybe a solution there would be to make the flip lower and jump higher? That way there's some obstacles you can't flip over that would require a jump, and naturally it would make jumps a bit more punishing, using them in places a flip would work would mean you're in the air longer and potentially hit a different hazard.
Another thought is currently tentacles just appear but it'd be neat if there was some warning like the ground cracking or something like that? I'm not sure they do damage immediately anyway but it might help not freak out the player lol