Despite the lag being an issue for the web port, that's just a poor excuse for it not being implemented properly for it's web premiere. A High performance gaming computer should NOT have slow down on a simple flash game. The game itself. Grinding and boring. Uninteresting terrain that is repeated throughout the surface areas with clunky movement on top of combat controls sometimes entirely unresponsive to your keyboard presses. A linear little side scrolling adventure game banking on the success of the first installment. I find it cute how a dad and daughter made this together, but it's just poorly optimized. More solid response to your key presses, and lowering the performance issues would be a good idea, but as it stands this is not a good way to advertise a 10 dollar game on Steam.
It's an alright time waster, I just wouldn't spend money on it. Mostly just the clunky controls and movement ruining it.