Might I suggest adding an Update Log into the game itself? Quite a few people on kong don't read the Update tab that Kong provides, so they don't know when a game like this gets updated.
If you've played the game any at all, you'd know the controls. If you read the description of the game at all, you'd know the controls. And the game is easy enough as it is, why would you want it easier? How hard is drawing a line with your mouse, and watching your character slash through where you drew the line at?
TL/DR: Read the description OR do the story line for the controls. Game is easy.
Is it just me, or is the Demon Sword just overpowered? Not attack wise, not attack speed wise, but the effect it has. 5% life steal doesn't sound like much sure, but in later levels when you're hitting 100ks from the flow chains, you heal back up pretty quickly.
Run around in circles gathering enemies in the center of the screen. Do this for about a minute, without killing any of them. Then shoot them once. Gather the resulting pixel piles before they get too far apart, and you'll be instantly boosted to the end of the game to fight the final boss with about 4 or 5 million hp.
Nice way to "git gud" in the game is to build up your skylab as much as you can, and send Promethium to your ship to sell. No need to pay for this game at all. You can literally farm Uridium in game from killing enemies. Sure it takes along time, but it's still better than paying.