Edited because when I read my comment, it felt like only negative comment. But I actually rated your game very well and played it 4 times!
The game was fun, the concept is cool and could be expanded upon (which is a great thing)
My original comment below!
=====================================
The idea was nice but I felt that the strategy was not deep enough. When there is only one enemy, basically having anyone block means skipping a turn, and the only desirable thing is having the player and monster both attack. When there are two monsters, having the player block means nothing happens. When the player attack you want the first monster to attack, and the other to block.
Maybe having the attacker lose a bit of HP when the opponent blocks (lika a counterattack) would have given more depth.
Or three options like "attack", "block" and "Wild attack", where you can block an attack, but a wild attack breaks the block, and an attack is faster so it breaks a wild attack.
Or simply having the player regain an hp each turn so you can voluntarily stall the fight to recover.