Play in fron chain ring

Looks like the spider itself is separated from the crank.

Your first step will be to remove that crank to get a better look (it will require a crank puller), but as far as I can tell you’ll probably need to replace the crank. The chainring itself may be fine, but if you keep riding with this, the chain and the cogs will experience very accelerated wear.

Actually it would be a good idea to gauge the chain’s wear, pedal-drive EBs go through them quickly enough even when everything is fine

Edit : upon doing some research, I realised that the spider and crank arm are two separate parts. So it may mean you just have to tighten something and be done with it. Still, you’ll probably need an ISIS-compatible crank puller as a first step.