They wouldn't be in dire need of cash if more people bought their amazing arcade games :(
Nex Machina was a genuine 10/10, even had the original Robotron designer working on it, but Housemarque's particle fetish may have turned off a lot of people who found the game to look too cluttered and people with lower-end PCs who couldn't run this game properly (I have to play it on Low if I want a stable framerate).
Didn't help that most of their games aside from Nex Machina and Outland were console exclusive while having barely any presence on the PC market. They released another game on the PS4 around the same time as Nex Machina, called Matterfall, which received next to no marketing at all and was quite frankly just "ok", but didn't sell nowhere as good. The development costs of releasing two ultra-niche games with way more production value than most modern games of this type have around the same time must've been murder when it predictably turned out they weren't multi-million hits.
It's unfortunate, but Housemarque feels like it's getting a bit too big in size and average production value to be making XBLA-styled titles.