I looked at this a couple of times today before finally digging in and as I completed each level I looked forward more and more to the next level. And then there were no more levels, far sooner than I expected. I hope the author adds more in time.

Edit: Oh and earlier today after having looked at it many times I bought http://www.lexaloffle.com 's combination of Voxatron and Pico-8. I've spent sometime today learning about Pico-8 (to which I'm going to limit my attention for now) and I think anyone interested in the linked game might be interested in these as well.