thanks for the feedback. there were many more ideas on how to expand the game, for example there's a system for type of damage, arrows do pierce damage while stones do blunt damage, already implemented. but i havent had the time to do more enemies to take advantage of that. also theres's a score system, but without HUD to show.
to get to the point i agree adding tutorials, having level objectives and more stuff would make the game a better experience. but for a gamejam project it fullfilled the goal of proof of concept.
there are 3 units in the game, one is unlocked after arrows spawned 3 times. the last one is unlocked after arrows spawned 2 times and stones spawned 5 times