Basically, it is a game of balancing risk. You try to survive as long as possible while balancing the age gain and loss via purchases. Random events make it a bit more difficult. Once you feel you are at risk of losing it all - getting too close to age 0 or 100 - you then hit the "ascend" button to finish the game. If you don't press it in time, you only get your score without a ranking.
The game was made in a few days by relatively inexperienced people, so it is a neat idea, but small changes could make it much more engaging 😁. E.g. a more clear UI, balancing, creating an incentive to actually order stuff, more content (score rankings, random events, purchases), a way for the player to track which rankings they have achieved.