This demo demonstrates a very annoying and very old bug. See <http://code.google.com/p/hedgewars/issues/detail?id=403>.

how the placement of girders awkwardly makes the cursor jump far away from its old position when I place the girder while moving the cursor. When I didn’t move the cursor, the cursor didn’t jump as well.

I demonstrate the behaviour both using the mouse and using the camera movement keys to move the cursor. Watch closely the cursor position.

Girder_Failure_Demonstration.47.hwd

This shows how there are bugs in how the mortar and molotov bounce off of the rubber at certain angles, and how they sometimes just break. Also, shows the larger than usual "pow" image which the cleaver makes on rebounding, which may or may not be intentional.
The demo is longer than it has to be, since I also tested other weapons.

Rubber_Bugs.47.hwd

Spoiler: Wuzzy wins.

Default2013_Wuzzy_vs_KompleX_2.47.hwd

Spoiler: Wuzzy wins.

Default2013_Wuzzy_vs_KompleX_1.47.hwd