I was planning on updating the game if people liked it. I'd also like to add Steam achievements some time in the future. I think the main issue is that the rate at which new cards appear is a bit low. Once you get to the later levels (around 2,000m+), the gameplay itself becomes rather different because of all the chaos. The gameplay was mostly meant to change through the use of different decks though. I've also considered adding boss fights (and other special events) on top of adding more things to do within the levels. So far, the core mechanics have been received pretty well, so I'll probably make some updates if things continue to go well. ^-^