Hey sakurataka! Your english is fine!
Takodachi has no HP! They die only if the hunger or fun reaches 0, it takes several days!
The gauge with a heart is the love gauge! Taking care of Tako (food and games) gives you love too! If you do not take care of Tako, the love will slowly reduce... Please take good care of them!
The coins do not work yet! They will allow you to buy hats for Tako one day. Does the Kotori game quit immediately or after you see "WRONG"?
I am very happy you liked my game!