We prefer short science fiction between 1000 and 5000 words in length, though we'll consider stories that are longer. Ideally, we'd like to receive fiction that is intelligent, with well thought out plots and characters. Beyond this, exactly what happens in your world with your characters is up to you. We enjoy a broad range and don't want to stifle author creativity by having elaborate expectations. Often enough, the best stories come as a surprise.
Although Kasma is a science fiction publication, we have been known to (rarely) make an exception and wander into other genres (e.g. fantasy).
Literarium listing here: https://literarium.net/market/kasma-sf-magazine/kasma-sf-magazine