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It's okay. Needs a save feature, and you should be able to revert and change your build when you die. It should not be so incredibly time-consuming tracking down all 4 bosses. It's not challenging, just a slog.
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The game is grate but it is unbalanced. In the firsts upgrades there is no fun to fight the big guys , because the reward is low and the damage dealt by one shoot can almost make you lvl 1 again. But its a very good game.... the boss fight could be better .... maybe a bigger bubble...
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The biggest problem I had was finding the final boss. I ventured on into one direction for about 50 bubbles until I finally found it.
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Just a heads up if you manage to defeat the final boss before killing the "4 menacing bubbles" you can still get them if you kill them while invincible.
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Once I got to my final level, it was unplayable. I would click to fire and it wouldn't respond for 3-4 seconds. Super unresponsive.
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Heavy tank, that's how you win. Don't do any other upgrades. Strictly heavy and the firepower upgrades. The bubbles get tougher the higher your upgrade and if you lose progress it's nearly impossible to get back up. With heavy upgrade you'll have more health and the most firepower so even though you're slow you'll wipe out enemies before they can lower your health very much. Max heavy tank is OP
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Not knowing what all the builds do does suck when you can't change to go on a different path. Certain paths sound useful, but when you choose something that is no longer viable you have to restart the entire game =\