Okay, that was BRUTAL! It got me playing for like hour and a half. Really addictive!
The concept is really well made and it fits the jam theme with its simplicity both in presentation and gameplay! The amount of content is really big for a week-long jam!
My only nit-pick is the overall balance. I think it's mostly good, but it has some rough edges, for example the currency, which could end your run early if you don't get any passive that gives you money (like the piggy bank) be cause of the difficulty of the game, which is definitely on the harder side; or the melee units, who most of them feel useless 'cause of their lack of tankiness and damage overall (Except the paladin, both the healing and shielding makes it one of the best units for sure). Also, some AI interactions don't work together, like a jewel mage that pushes the enemy flower even further while it kites you, preventing the other units from attacking it T_T
The only small bug that ended a run (luckily early) was that an enemy spawned inside a rock, or got stuck with it, preventing it to be attacked or to attack.
But even with those small details, it's an AMAZING entry overall, definetely one of my favourites! With a bit more polish on the presentation, more content and some small re-balancing, could easily be an absolute time-sink!
Also, for being your first game jam you did a phenomenal work overall!!! GREAT work, keep it up! ^^