I really like the combat mechanics! The dash slash is very cool and satisfying, and the mount and kick is really unique! I also love how it heals the player if you hit the enemy against the wall or against other enemies (even if it doesn't make sense lol). This encourages you to actually use the technique in combat rather than spamming dash-slashes in large groups of enemies. Although, I think it was a little finicky, but that can be improved with polish. The movement and camera perspective was also unique and not too bad to control. I would have liked some more variety in the exploration since a lot of it feels like long hallways. I also think some enemy attacks could be telegraphed more. For example, the triple shot things were hard to predict when they would shoot, so I couldn't really figure out my window to attack. But I liked the "metroidvania" mechanics with the eye allowing you to see more platforms and the dash slash acting double duty, allowing you to also break down walls.
There's lots of great stuff here and the presentation is solid! Congrats to you both!