It's impressive how you made everything from pretty much scratch, including the music.
Very long loading time with no loading screen. I thought my game froze. I think a simple animation would help in this part, like a rotating hourglass or something else that's more fitting.
The gameplay is kinda wonky. It still works, but the animations are maybe a little bit messed up. Though the robot enemies instantly falling down after kill is really funny, even though it's unintentional. It's especially funny when you parry their attacks, and the next second they just teleport to you and fall down.
Speaking of parrying/countering, I think it's a little bit too OP right now. You can just wait while the robots go into a line formation, and keep countering when it's their turn to attack. Maybe instead of instantly killing the enemy, countering makes them stunned and unable to attack or move for a while.
Also some parts are laggy. I notice the lag the most while loading for the first time, when the enemy spawn for the first time, and when I activate the explosive attack.
I think a hit indicator would be nice. Sometimes I don't realize I got hit until I saw my health bar.
Art style is really good though. I like the stylized look.
For the audio, I think the music is too low. I don't really hear it, unless that's intentional. The SFX is pretty good, though sometimes it didn't play correctly.
Overall, if it were a little bit more polished, I think it would be a very fun game. Good job!