Not sure if this was intended, but increasing the speed also significantly increases chest refill. Use this with Joemama's comment and you can triple the speed you collect. Interesting game mechanics idea, but turns into a mindless grind.
I'm sorry, but the comparison to 10,000,000 is much more valid than comparing this game to any match 3. I would agree that you can't call any match 3 game a clone, but the gameplay goes further in emulation of 10,000,000 whether intentional or not. The sidescroll dungeon crawl and upgrade to proceed is basically a skin for 10,000,000, so please don't be so dismissive of those of us asking questions. We simply want to know if you are acknowledging 10,000,000.
I'm not going to rate this game right now, and I will try to use constructive criticism, but there are some serious things to address.
The font is truly unreadable, I couldn't read the instructions. This will stop many players right away.
The game itself has no real goals that I can see. After you gain more than the first two towers it is impossible to lose. What are we trying to do?
I really try to support new developers, so I hope you read this. The graphics are interesting, and there is a hint of a minimalist type of game here. Work on this one some more, add a bit of content, see where you can go with it.
 "Swords and Souls"){kind=icon}
 "Hut Defense"){kind=icon}
 "Token Hero"){kind=icon}
 "Bubble Tower Defence 2"){kind=icon}
 "Fort Defender"){kind=icon}