Tower Storm - Multiplayer PvP Tower Defense

I'm trying a new take on the Tower Defense genre, making an easily accessible TD game you can play together with friends either versus bots or each other. The game is made for 3 vs 3 games but less is fine too.

You build and upgrade towers as normal. Then you also send minions at your opponents defenses. You gain more income for every minion you send. Minions drop soul stones when they die which refresh them and also give them xp then once you've collected 30 gems for a minion it will level up becoming much more powerful.

There are 2 castles on the map on the way to your opponents base with 50 health each, when you destroy them your minions gain 10% more health and speed.

Please let me know of any bugs / issues or if you have any suggestions or ideas on improving the gameplay

I know the UI is pretty bad I'm just focusing on making the gameplay good for now.