Awesome puzzle game! I really enjoyed it. The Portal tile was wild - lead to my demise because I couldn't use math. I didn't get my cookies back if I failed a level and restarted and the tiles that I used, even if wrong, just remained there. So I could start from scratch. That was really risky, so I guess I had to plan better from the start.
There was a menu bug on the first couple of levels, when I scrolled, I lost the menu completely, wasn't sure how much I needed to scroll to get it back but thankfully I didn't need to buy any tiles.
Overall, all great job! I would love to see more.