Hello, thank you for playing my game. Yes, there are three boss fights in the game. It seems many people find the training level challenging. Maybe the bottles fall to fast, but there's no time limit for hitting 10 bottles in 10 shots ; take your time and aim carefully. Here's a gameplay video of the training level:
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Ok, I think I understood the tutorial wrong. I thought I need to shoot all 10 bottles but apparently you are not restricted by bottles falling but your bullets. A bit unintuitive but at least the tutorial is a bit easier after realizing that.
Went and replayed the game based on this info. The henchmen levels are maybe a bit dull and they drag out too long. I would have preferred shorter levels as nothing really changes during the level and there is not much challenge. But boss levels are quite fun, I must say!
Updated my rating accordingly. Thanks for the advice!