This is a very nice and simple concept, it is straightforward, and with just a little bit of effort, you can see the enemy's pattern, and when they are vulnerable, like the pig for example.
I encountered a bug in Wave 12, where all enemies had been eliminated, but the game would not proceed to the next stage.
I liked that the player will not die if hit, while it take a huge chunk of challenge away from the game, it goes well with the fact that this is a simple game, meant for light-hearted fun, you do not have to be a hardcore gamer to enjoy this game. The 1 minute time-limit is a plenty too.
It might be more interesting if there are more enemies to be introduced than the flying monster and the bubble pig. A good background music might be good too! The howling wind gets quite bothersome after some time :)
This is a decent game, try it!
In case you are confused about how to shoot the bubble pig, if it is covering itself with the bubble while preparing to shoot, it is invulnerable to arrows.