Add new terrain

[kodokoto]

New interactive terrain should be added.

For idea's we currently have:

• [x] lava (DOT when ontop)
• [x] ice (Movement slowdown)

Both of these have been implemented, but we should brainstorm here, see if we can think of others.

[kodokoto]

One idea, we could recreate Celetse's bubble mechanic. Instead of a bubble, maybe we could have brooms floating in the air?

The mechanic would be like this:

• Player lands/jumps on a broom.
• Movement stops
• Player chooses the direction angle using WASD keys, limiting the angle choice to 8 directions (cardinal and intercardinal).
• Player presses space to fly towards that direction fast.
• Player presses space again to jump out of the broom, broom disappears.

This could be either an environmental feature (where the brooms are floating as part of the level.

Or we could change this mechanic and make it a spell, where the player uses their want to conjure up a broom.