That's an unfortunate situation...
Here's a few tips that might help:
- Where possible use corners, narrow passageways, and doorways to limit enemy line of fire
- When you lose your propulsion you effectively are using hovers for movement. A strategy that sometimes works is to drop stuff until you have a fast movement speed.
- When you destroy a group of enemies try to get out of that area as soon as possible. More are usually on the way.
- Use service robots to block enemy line of fire when running away.
- It will take time to know instinctively when to stand your ground and when to run away. An error I used to make in the 7DRL was to bail on an easy encounter and then run into another group which would be easy to deal with too if I didn't already have enemies on my tail.
I hope this helps:) There are a few more tips I could give, but those are the main ones I would concentrate on at this stage.
Good luck!