Boomerang Bloodlust

(Made for the Weekly Game Jam Week 195, theme "Boomerang") You are armed with but a boomerang, and will be bombarded with wave after wave of zombies. Kill as many as you can in as quick a succession as possible to earn as much money as you can. With this money, upgrade yourself and your boomerang, and, when you've gotten all the Single Upgrades, pick an upgrade path. The possible upgrade paths are…