Irukandji is a score-based vertical shooter that currently contains only one level to play, although by beating the game for the first time you do get another ship that can be used for your subsequent attempts at unlocking more achievements. There are multipliers and power-up items to collect, and you can also destroy enemies with your special missile weapon by holding down the C key.

Players can only unlock two ships in the demo. The full version features six different ships, a full set of achievements, online high score tables, and will cost a dollar to purchase. (Mac/Windows, 11.7MB)