It's a nice action game, but the platforming needs a bit of work.
The character is too floaty, plus the control in the air is not great for the later levels where precision platforming is expected. Attacking to extend your air-time is a great mechanic, still it'd feel better to be able to cut it short or redirect the momentum.
The hard levels are great, but seem almost impossible without perfect timing. The wall-jump detection needs a bit of work to make them hard instead of frustrating.
Also, invincibility frames are needed. The lava is not an insta-kill, but might as well be. And sometimes I got stuck bouncing on an enemy or them bouncing on me to instantly die.
As for the extra files, seems you exported a debug build. The export of a simple project shouldn't have that many files, it should be only one `.exe` file plus the `.pck` file.