Nice game. Though you didn't make the assets they fitted perfectly together, which isn't always easy. Especially the hit effects
When I actually started to get into the flow, and started creating some different strategies, very nice. The main strategy I created is mid air jumping as late as possible, to still be able to reach the top of a spike. This massively reduced the amount of arch I had to mentally draw to get to land exactly onto one. My highscore is 90.
Two main points of critique:
1) When learning the game I was more in the waiting screen then actually playing. This is the most important playtime as first impressions are everything. You could've either made an easy/tutorial mode where you have lives or the sword bigger, or made the time it takes to get back a bit shorter. Calculating when to do a mid air jump is very tough, and when you just started playing it might take over fifty tries to get past crystal three.
2) I thought for a while that the mid air jump animation was also the hitbox of the swing if I had hit. I thought that the first attack after you bounced had a larger hitbox (which would've been a pretty cool mechanic tbh).
But overall a very smooth experience, like others have said.