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Glad that you like it! 

And thanks a lot for the feedback! Balancing the levels is tough. We wanted players to max the upgrades before finishing the game. And for level 4 timing the shield usage (upgraded to the max) is key.

If you like to finish the game and your progress is lost, i could send you a savegame from level 4. Thanks for playing! 

Oh, i just noticed, you are the one who submitted "ticket to space" which i played recently. Really cool game!