Increase size of health bar UI

[cdsupina]

The health and shield bars are too small. We should make their UI larger and easier for players to keep track of.

[cdsupina]

A larger health bar may not be strictly necessary, but more feedback when the enemy is damaged would definitely be helpful.

[dh337071]

I was thinking about this and in other shmups enemies tend to "flash white" when they are hit.

edit: I just realized you made a similar comment back in May,

[cdsupina]

Ui updated