Thanks for playing! The characters are indeed billboards and the randomness can definitely unfairly punish you, although waiting for the enemies to approach instead of approaching them and using the stun effects both from consumables when there are several enemies and from the Immobilise option when there's a single enemy is left (to save consumables) can help a bit.
By the way I had tried to play your game but unfortunately I think it won't run on my old rig.