Alternative to the cordless screwdriver?

No, because our actual garden goes in a different direction, and it’s about 150m to the next building there (even if it’s not all my property). The terrain is slightly sloping there (barely noticeable on foot but if you put something big there, it would be), on a flatter part there is a sandbox, trampoline etc., otherwise I planted trees there. The rest of the garden also has sun from morning till evening, and between the houses the climbing frame has shade here and there, making it easier to climb, especially in summer. Otherwise, the price per square meter here is already 200,-, not the most expensive for NRW with good transport connections and central location, but enough. So: it’s not as cramped in reality as it looks (the neighbor has a wide double garage for example, the house is not as close as it looks in the picture – probably due to the lens/zoom combination used), and I do not feel cramped at all. But I have also lived in larger cities (e.g. Dortmund) in an apartment, and a detached house is definitely another league. If you come from the countryside with 2000 sqm plots with a house in the middle, you might feel differently. Apart from that, I know new development areas where the houses only have as much space as a main garden (so at most that much on each side). That would actually be too cramped for me.

Then it is good for you. The picture just gave me a slight panic attack and I am actually not prone to panic.

Now that's what I call a climbing frame

Cool climbing frame - we have a similar model. You really need some screwing power for this - hex screws, "regular" screws. Does yours get used a lot? Our kids more or less ignore it (except for the swings), unless the neighbor's kids are around... ... and for that, you really screw your soul out of your body

So moderately much, since my older one is 2.25 years old and the little one is 0.25, but I have hope for more; however, it has already been extensively tested by older children. But the older one already manages to climb everywhere (with a safety hand of mine nearby), and is always especially happy to stand high up on the bridge. But of course, the swing is used the most.
Although screwing was only half the work, before assembly I primed and varnished each board and timber (about 400 pieces) from all sides twice, which took time :/. But the thing is supposed to last a few years.
I'm really glad that nowadays you don't have to work with screwdrivers, etc. anymore. Oh yes: my small Metabo cordless screwdrivers also fit the 10mm auger bits, and with them I could actually make the large holes in the timber. The lucky thing about that was: since I only made these holes (e.g. for the ground anchors and assembling the bridges/towers on site) at the end, there was no space for a corded drill in many places (I tried that first, because the drill bits are longer than those of the cordless screwdrivers).