|tenmado is a vertically scrolling, late 1990s style (that is, a massive number of enemy shots against a smaller-than-it-looks spaceship) shoot 'em up game. A very accurate collision detection makes it a game of dexterity. If something looks like a triangle, it is a triangle, not a rectangle of similar size.
However, surviving is only 20% of the game. The main feature of tenmado is the "color chain bonus". You can get a very big score (about 100 times bigger than a normal enemy-destruction point) by destroying enemies of the same color successively. It is easy or difficult depending on how greedy you are.