This level has been driving me nuts. As much as I hated to do it, I watched the synopsis video another player posted, and when they played this level the circled opponent was where I put the red X. Did this change? If so, are there any suggestions someone can give me as to what I need to do without solving it for me? I'd like to actually beat this game, but at some point I'm going to have to restart my browser and don't want to play it all over again!
Yeah, the level was changed to fix cheese. You can press Control + Q to skip levels if you need to restart the game and want to get back to where you left off. As for a hint, if you can get to level 2 you can defeat the slimes without them being pushed onto the spikes; to solve the level you'll need to be at least level 3.