Hey this is really well done, your battle system is solid and easy-to-learn! I did immediately find a bug/cheese which makes the entire game trivial: when you go to confirm your attack, you can continue pressing inputs. At first I thought this was just playing sfx (like if you press up/down it plays the menu sounds still) but no, you can in fact just spam Z to do your attack repeatedly until the enemy is dead. So any unit can kill any enemy in a single turn.
Anyway the sprites look nice and the battle system is solid, you did great work for a solo jammer! Nice work.