Definitely well presented. The concept is stimulating and fresh even if it feels incomplete. I can imagine some systems that could make this more engaging:
If the thing is to make a challenge and tension from buildings accidentally clashing some time pressure could help. Cards could have expire counter from the moment of picking up, so building must be placed quickly.
I cannot currently see any incentive to stack towers, it seems more efficient to build flat (which is also more boring). I think stacked buildings could have some kind of income bonus.
I wish there were more drastically different blocks in terms of size/shape/aesthetic.
Viewing post in Stack Island jam comments
At the moment it's more like a chill idle game in this sandbox island. But I will definitely explore crafting a different mode that pushes the player to build faster and take more risk.
Adding a bonus for stacking towers could be really satisfying as high rewards comes with higher risks.
There are only a few blocks that is harder to balance and they only unlock late game. So having a more varied lineup of blocks earlier, could unlock different strategies and improve the gameplay.
All of them are great ideas really, thanks a lot!