Rename the modes easy mode for choice and hard for gusse or label them because how are we suppose to know how to spell it or if it was put in spelled wrong.
i don't see much diffrence from the original but there is a glitch where you get stuck in the wall for a period of time. Almost like an invisible tunnel in the wall that is hard to find your way out of.
Too basic i suggest adding levels. so its not just a never ending round with the same continues difficulty. If you do add levels than make sure to put some kind of boss like level with a really big guy instead of several small ones. Changing the background or font.
Also i think that instead of making the map move make the goal move left to right and then move to the other side and just repeating that. And with the guys to just send them in different dirictoins at different speeds.