I did program some progression till level 8. It is very hard to make progression because you need to have stats about the gamer to able to put just the exact amount of enemies to keep it in the edge.
I was inspired a bit in Glyphica, but more in kingdom rush and mini metro. I only had like 2 days (not complete) to do everything from scratch. I would love to have a more polished version for a fair testing.
Thanks for the feedback