Thanks, glad you like it.
Yea, I made it in like three hours, this is my first time joining a game jam so I didn't really expect this many people playing it...... You know, I noted the lag before release but I was too lazy to fix it...
You are right, this game can be upgraded in many ways. Maybe I will make a version with more mechanism later. This game is very easy to write so I think I would just write a new one.