Self destruct feels a bit overpowered for the enemies, like a 1 hit KO.
I gave the yellow tank all the big damage cards and distributed healing and energy buffs to the other two, and the blue one got sniper shot.
I didn't really use the 5 energy cards or the damage-dealing 0/1 energy cards. Never used the aiming buff cards, and didn't think the flower pattern attacks were that useful.
I did notice lag spikes sometimes on hitting an enemy with cards like the Blast Gun, and the raining heal card won't reach your ships that are below another one, which seemed odd in space but may be intentional.