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Some tips to make this game better:
1- Make an option to turn the blimps off/ make the foreground transparent when on the back of the stage.
2- Have the game remember when you have done; if you've collected 100 coins in a previous run, the Quest will automatically update without having to collect 100 coins again.
3- Cheaper upgrades/gems worth more when collected. The game is terrifyingly slow right now and it feels like too much of a grind to keep playing.
4- Keep up the good work.
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I feel like the Quests should be able to be completed whenever. What I mean is that if you get to the 6th stage early on, you shouldn't have to get to the 6th stage again once the 'Get to the 6th Stage' Quest becomes available.
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could part of it be made transparent? certain parts of the back-layer are practically invisible as it is now (enemy behind high section of front layer) and the blimp-markers have a tendency to float in front of an enemy (in my case certain parts have a continuous line of blimps where an enemy can be hit without seeing any sign of it until you hit it)
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If you haven't started this, don't bother unless gem frequency is changed. You can buy NO upgrades, and still finish every quest without enough gems to unlock the next level.