The level to get the triple jump boots are bugged. I jumped over all obstacles, got all the collectibles, and I was slightly in front of the enemy, yet he still got the boots before I did...
The game is fun but unbalanced, in the first half of the game, the energy bar makes you stop playing every few minutes, if you want to save those precious gold bars; while in the latter half of the game it doesn't affect the game at all. Also in the latter part you end up with too much money, but too little gold bars, because there is no easy way to gain them after you complete every achievement; would be good if you can trade money for them.
The second boss is buggy, it doesn't disappear when killed, but kept summoning more and more minions. Which means you either grind combos, or suicide to get out of it. Either way you cannot pass the level.
For all those people who hates the endless black, save your game right before you spin the wheel, and if you know it's about to stop on the black, close the game before the wheel fully stops, then reopen the game again, your original money should still be there.
I think it's pointless upgrading the "Extra Time", unless you are going for 100% completion, as you can always start another wave without losing anything.
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That's strange. We've never experience it. We will try to fix it. Thank you for the report.