I thought it was pretty normal to use a-d for movement with the fingers and space for jumping with the thumb. But then again it doesn't cost me anything to add W as another option, so I did it, there's probably a lot of people who expect it to work that way already if I tell them "wasd: move".
You're right that the level design is very lazy at the moment, I mostly just copy pasted the same 2 enemies and 1 platform around to make it look a bit more like a game but I haven't put any real time into it yet. Once I'm done with the mechanics and when I have a few more enemies I'll try to do a better job with it. Thanks for playing and for the feedback.