Thankyou for the detailed feedback!

There's way too much for me to respond to all of it here, but a lot of it is being actioned! This is very helpful.

Thanks for giving it a playthrough!

I am still finding the right balance for tight spaces and open spaces. Different tilesets will express the terrain with different shapes, too, with some being more vertical than others. Dead-end cavern branches are coming soon, which should shift the game's focus a little bit more toward exploration.

Right now, there's a single clickable mission on the "world map" that generates a 12-segment cave (at approx 5 enemies per segment) with the Jungle tileset. The plan is to generate missions of various lengths across different tilesets, and different missions may also generate with constraints or modifiers such as time limits or higher/lower enemy density, so terrain pressure will not be the only thing to consider when the game is complete. Underwater missions are currently on the "maybe" list, too.

Ship drift on the x axis is something that's been suggested a lot but I think you are the first person to suggest also slowly drifting down on the y axis. I'll play around with gravity and see if anything sticks; ship drift might be an interesting opportunity for crew members with engineering/piloting perks to tighten or loosen controls.

I've found one lockup so far and instead of fixing it I wrote detection for it and plan to hook it up to an achievement.

I appreciate the feedback, thanks again!

Reuploading with window resizing options now.

To play with the resolution of the game, open game/savedata/savedata.txt and adjust the following fields:

WINDOW_WIDTH|640
WINDOW_HEIGHT|480
ZOOM_FACTOR|2

The previous settings:

WINDOW_WIDTH|1280
WINDOW_HEIGHT|960
ZOOM_FACTOR|4

Thanks for the feedback! 

Visual feedback when taking damage is on the to-do list.

Each ship has starting HP and max HP. Certain crew members increase your start HP, so it is possible to begin a map with more than your max - these are the blue blips on your HP bar (similar to LifeBlood in Hollow Knight), and they are not recoverable if you take damage.

Heart pickups do refill red HP blips though.

Thanks! Taking damage in general will give more feedback soon. SFX and a little bit of blinking should help make it clearer when the player gets hurt.