As others have pointed out, obviously this was a lot of ports and indie games, but the fact that companies are trying to release so many games on Switch shows they have faith in the platform. It may also be indicative of whats to come.
In 2017, no one had any faith in the Switch. Third parties assumed it would sell like this Wii U. This is how Wii U had more launch games than Switch (30 vs 12). The Wii U had more faith due to the Wii's sales and the Switch had less faith due to the Wii U's sales. Naturally this was foolish thinking because its been more often than not the new system follows the success of the old one, but I digress. In 2017, it was clear the Switch wasn't a fad and would go on to be a success. So companies scrambled to get as many games on the system as they could. Thus, the porting. Keep in mind it really didn't go into overdrive until around 2018. Game development takes around 3 years which is why we haven't really seen much besides ports and indies (which have a shorter turn around time).
What is also happening is Sony and Microsoft are joining Gen 9. Now, console launches are a big reset and it takes some time for the install base to growth. Third parties have become risk adverse which results in the cross gen games we normally see (and will see again in 2020). The Switch already has an install base of around 50 million units, while the new consoles will have 0 (obviously). I expect we'll see many publishers (namely the Japanese ones) start making games for the Switch as a way to hedge their bets on the generation. We should soon see more and more developers throw their hat into the ring.
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