Alright, it's cute and all, but there is very little actually going on here and what is there carries a lot of flaws.
The hit detection for both attacks and enemies seems completely unintuitive, with either the PC's or the enemies' hit box not being determined by the associated image itself. Half the time I hit something, I didn't know how other than the fact I can spam the "x" button and win in a few seconds.
Speaking of which, I can't even tell what the winning conditions even are. Sometimes I win after killing three things, sometimes it takes five, sometimes I just kill until I die.
The music and art is fine enough, but if you decide to continue adding to this project, a little polish will go a long way.
Another observation: the "lose" and "win" text isn't centered in the screen. That will make it look much better.
I'd strongly recommend adding reactions from the enemies when they get hit (knockback; temporary inability to deal damage; etc) and adding different enemy types rather than sticking with the same enemy and three different "skins".
The same for the PC. I'd suggest a temporary invulnerability after being hit by an enemy. The way it currently works (with taking a hit every time you come into contact with an enemy) can cause the game to become complete unreasonable if enemies are going to just keep spawning on top of you.
I mentioned the music before, but I think it's a relative highlight here. it's a nice simple style, which doesn't appeal to everyone, but I like simple repetitive tunes in games like these.
That's about all I have to say. The last thing I'll add is maybe don't upload the same iteration of one game multiple times. Especially all at once.
Keep working, though! I'm sure your projects will improve shortly!