Pretty cool concept. Nice take on a tower defense gameplay. And nice implementation of the limitation.
Its got potential. Great job.

I really like the concept! And it's pretty addictive, I don't want my sand castle to be destroy by bullies^^ Clicked on some cards without having the time to read it because I was building something at that same place, oupsie

Very nice concept and execution. I liked the building variety and different enemy types (although the small guys felt like a cheat)

Pretty cool! Loved how the limitation was used to build up the whole game concept with the sand defenses decaying over time.

Nice game, I think all timers kind of took away maybe bars or just other visual cues would work better.