Hyper Lode Runner

You can zap blocks to create temporary holes to trap enemies or to escape through to platforms below.

To make levels more interesting there are ladders and vertical ropes to climb, but the enemies can use these too.

There are 50 levels to play, and there is also a VS mode and a level editor that gives the possibility to create up to four levels each with the timed sub-levels but unfortunately without any possibility to save them.