(beaten easy) Great, the game really shines compared to other itch stuff.
Gameplay: Pacing is troublesome in many ways: I found tutorial unbearable and learned on the fly. I assume all cards can appear from the beginning - that a total informational overflow! (Also it kills the simple joy of progression, when you unlock best things in the end) The fact that all upgrades up to the max upLvl are unique, worsens it. Overall structure of just one huge lvl can be improved! Its a prototype, I know, but just simplest map would be a major improvement, as smaller missions give much more granular feedback on your strats. Feedback is a problem with tower defences in general...
Graphics: For a long time I found all the towers indistinguishable! (green one pops) Also I can't quite tell why, but enemies look cheap - maybe because they are 1px thin in code..
Overall, despite deck-building aspects, I think it plays just akin to classical tower defences, best of which are of course just unreachable at this point.. Innovate more please.