Bomb entity (suggestion)

[Siavoosh]

Bomb entity can be added to game in order to blow a radius and player can't pass too close to it. if so player dies. Bombs can be introduced by an integer like "5" and subtract every frame and eventually go off when reached "0" and in the meanwhile if player was too close (1 cell away for example) he/she dies.

(just trying to find a better use of function "hit_with_margin" added in PR #10 & #21 )

[panoschagias]

If this gets implemented, my suggestion is that the bombs should be rare, or they should appear only when the river is wide enough. My thinking is that, most of the time, the river is only a few characters wide and thus the bombs, if they have the same frequency of regular enemies, will make it almost impossible not to loose.