Archer is a retro game where you fire arrows at waves of enemies. You can upgrade your character (arrow speed, damage, movement, powerups, magic spells). The campaign consists of 21 hand-crafted levels of increasing difficulty. You can play it on the browser (but the game won't save your progress), or you can download the cartridge file and play it on the LowResNX fantasy console (instructions on the game page).
This is a hobby project. It's completely free and the source code is available.
Background story: After a "rigorous" selection process, you were selected to defend the kingdom from enemies using your trusty bow. You are well known for your skills and also for your low fees, which suits the King well, as the only thing that's more important than keeping the kingdom safe is keeping the expenditures to a minimum. You will earn meager amounts of gold from defeating enemies, with which you can upgrade your equipment.